Introduction to Bash

• What is a shell?
• What is Bash?

Basics of Bash

• Invoking Bash
• Simple Commands
• Pipelines
• Tilde Expansion
• Brace expansion
• Looping constructs
  • until
  • while
  • for
• Using seq command
• Conditional constructs
  • if statement
  • case statement
  • select statement
• Redirections
• Grouping commands
• Declaring variable
• Using sleep command
• Using export command
• Common commands like date, ls, wc, w, locate, find
• Using Aliases
• Using backtick

Filesystem Management

• Moving and Copying files and directories
• Mounting and unmounting filesystems
• Linking files
• Absolute and relative file paths
• Partitioning
• Creating a filesystem
• Labeling a filesystem
• Swap partition
• Log files
• Configuration files
• Inodes
• rsync

Process Management

• Process Lifecycle
• Listing running processes
• Listing process tree
• Killing a process
• Suspending a process
• Moving
• Signals
• Cron scripts
• Exit code
• Load averages
• Daemons and Services

User Management

• Logging in
• Changing password
• Users, groups and permissions
• suid/sgid/sticky bits
• Creating and deleting users and groups
• Owner of a process
• Elevating permissions
• sudo user
• who

Network Management

• Network interfaces
• DNS lookups
• ping
• netstat
• SSH
• SSH port forwarding
• screen
• scp

Memory Management

• Checking free memory
• Checking memory consumption of processes
• Finding out more about the RAM

I/O Redirection

• Read
• Redirecting input
• Redirecting output
• Appending to redirect output

Environment Variables

• HOME
• USER

Some popular external programs

• sed
• wk
• grep
• man
• info

Bash Startup Files

• .bashrc
• .bash_profile
• .bash_login
• .bash_logout

Shell Arithmetic

• Use of let, expr
• Double parantheses $(( ))
• Arithmetic expansion

Other Shells

• zsh
• fish